Use fastboot in the android skd [google it], to adb push a custum recovery to your device to reflash a custum rom.

It is fairly easy. You will haft to use the cmd prompt in windows"cd.." backs up a directory"cd folder name" opens a folder

I belive in the start menu, the run box if you type "cmd" or "cmd promt" will open that.

Anyways look for a how to guid on how to use fastboot with your phone and how to flash a custum recovery like your phone is brand new.

The volum rocker that takes u to recovery, the opposit one will take you to the bootloader and you can choose fastboot, plug your phone into the computer and your phone is ready to accept fastboot prompts.